Limits on spin-dependent WIMP-proton cross-sections from the neutrino experiment at the Baksan Underground Scintillator Telescope

TL;DR

This study uses data from the Baksan Underground Scintillator Telescope to set upper limits on spin-dependent WIMP-proton cross-sections, finding no excess of neutrino signals from the Sun over 24 years, and providing competitive constraints.

Contribution

It provides updated, long-term limits on dark matter WIMP-proton interactions using neutrino detection, confirming no observable excess and comparing favorably with other experiments.

Findings

No excess neutrino signal observed from the Sun.

Upper limit on spin-dependent WIMP-proton cross-section is $3 imes 10^{-4}$ pb.

Limits are comparable with other neutrino telescopes.

Abstract

We present updated results of the Baksan Underground Scintillator Telescope in search for a signal from dark matter particles annihilating in the center of the Sun. Based on the performance of the Baksan telescope measuring upward through-going muons with energy larger 1 GeV, we confirm the absence of observable excess in arrival directions towards the Sun relatively the expectations from neutrinos of atmospheric origin for 24.12 years of live time. We conclude that the 90% C.L. upper limits on elastic scattering cross sections of dark matter WIMP (Weakly Interactive Massive Particle) off proton are comparable with correspondent limits of other operating neutrino telescopes. The best value of the limit is $3 \times 10^{-4}$ picobarn in spin-dependent (SD) interaction of WIMP on proton for mass range about $100\div200$ GeV.